Contradiction with Deuteronomy 17:6
Requires two or three witnesses to establish a matter, contradicting the Pharisees' challenge in John 8:13 questioning the validity of Jesus' testimony without additional witnesses.
Deuteronomy 17:6: At the mouth of two witnesses, or three witnesses, shall he that is worthy of death be put to death; [but] at the mouth of one witness he shall not be put to death.
Contradiction with John 5:31-32
Jesus acknowledges that if He bears witness of Himself, His witness isn't true, but another bears witness of Him, contradicting His defense of self-witness in John 8:13.
John 5:31-32: If I bear witness of myself, my witness is not true.